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<div class="moz-cite-prefix">Den 18.01.2024 20:05, skrev Andrea paz:<br>
</div>
<blockquote type="cite"
cite="mid:CANnPPRrykt+bg1EDKxxFZaFUcw3aEmGH7uOqMWPghB0_ksxvpQ@mail.gmail.com">
<pre class="moz-quote-pre" wrap="">Thanks for the link to stackexchange. Reading this post and others
(also the discussion on ffmpeg from when they switched from PAR to
SAR) I think the formula:
"Yet, with DAR = SAR * PAR
HDV 1080i: 16/9 = (1440/1080) * (4/3) = 1.7778
HDV 1280p: 16/9 = (1280/720) * (1/1) = 1.7778"
is more correct to write it (for ffmpeg and CinGG):
DAR = Width/Height * SAR
that is, the (4/3) and the (1/1) are now the SAR and not the PAR.
So it is no longer spelled PAR, but always just W/H and SAR. SAR, at
this point, is a "pixel aspect ratio"
I tried changing the txt (version 4). Do you think it is okay? It is
likely to be wrong.
</pre>
</blockquote>
<br>
Well, I have prioritized more to understand what happends than
interprete the somewhat ambiguous definitions.<br>
(the order of the factors is indifferent). <br>
<a class="moz-txt-link-freetext" href="https://stackoverflow.com/questions/18877243/why-ffmpeg-print-sar-instead-of-par">https://stackoverflow.com/questions/18877243/why-ffmpeg-print-sar-instead-of-par</a><br>
<br>
I think of SAR in the FFmpeg output as a correction factor for the
recordered picture frame format resolution (Wp), to get the desired
output display resolution (expanded Wd with square px) at a given
DAR, (or in opposite order).<br>
<br>
I found a useful table at ffmpeg-user that contains information for
practically all SD and HD video formats.<br>
Maybe something for the manual?<br>
<a class="moz-txt-link-freetext" href="https://www.mail-archive.com/ffmpeg-user@ffmpeg.org/msg27522.html">https://www.mail-archive.com/ffmpeg-user@ffmpeg.org/msg27522.html</a><br>
<br>
<font face="Courier New, Courier, monospace"><br>
display DAR picture PAR SAR =
DAR/PAR<br>
=========== ==== =========== ==== =====<br>
16:9-2160: 3840 x 2160 16:9 : 3840 x 2160 16:9 : 1:1<br>
4:3-2160: 2880 x 2160 4:3 : 2880 x 2160 4:3 : 1:1<br>
16:9-1080: 1920 x 1080 16:9 : 1920 x 1080 16:9 : 1:1<br>
4:3-1080: 1440 x 1080 4:3 : 1440 x 1080 4:3 : 1:1<br>
16:9-576: 1024 x 576 16:9 : 720 x 576 5:4 : 64:45<br>
4:3-576: 768 x 576 4:3 : 720 x 576 5:4 : 16:15<br>
16:9-480: 853 x 480 16:9 : 720 x 480 3:2 : 32:27<br>
4:3-480: 640 x 480 4:3 : 720 x 480 3:2 : 8:9 </font><br>
<br>
<br>
With FFprobe I have verified the Picure resolution, SAR and DAR for
the PAL SD DV(D) and HDV formats I'm using:<br>
<br>
<font face="Courier New, Courier, monospace">ffprobe dv01_07.dv
2>&1 >/dev/null | grep Video<br>
Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR
4:3], 25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc<br>
<br>
ffprobe dv07_05_wide_cingg.dv 2>&1 >/dev/null | grep
Video<br>
Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR
4:3], 25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc<br>
<br>
ffprobe dv_16x9_cingg_20240117.dv 2>&1 >/dev/null |
grep Video<br>
Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 64:45 DAR
16:9], 25000 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc<br>
<br>
ffprobe dvd_16x9.mpg 2>&1 >/dev/null | grep Video<br>
Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv,
bt709/unknown/unknown, top first), 720x576 [SAR 64:45 DAR 16:9],
25 fps, 25 tbr, 90k tbn, 50 tbc<br>
<br>
ffprobe hdv07_05.m2t 2>&1 >/dev/null | grep Video<br>
Stream #0:0[0x810]: Video: mpeg2video (Main) ([2][0][0][0] /
0x0002), yuv420p(tv, bt709, top first), 1440x1080 [SAR 4:3 DAR
16:9], 25000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc<br>
<br>
</font><span style="white-space: pre-wrap">
</span>
<blockquote type="cite"
cite="mid:CANnPPRrykt+bg1EDKxxFZaFUcw3aEmGH7uOqMWPghB0_ksxvpQ@mail.gmail.com">
<pre class="moz-quote-pre" wrap="">@Terje
For videos, can I ask you to do 2 and 3? I have never used and don't
really understand how DVD/BR works; and I haven't had players/burner
for a long time.
</pre>
</blockquote>
<br>
OK, I see there already is a lot stuff in the manual chpt 14. I
would expect a video is something Phyllis could do, but I also know
she is busy with a lot of work (?) I think I can contribute with
some additional screenshots for HDV to a 16x19 DVD and BD. Andrew
may possibly also add the procedure for a DVD video with LPCM(?)<br>
<br>
<br>
<br>
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